int main() {
	char text[100] = "hello world!";
	char key[100] = "o";
	char *pos = strstr(text, key);
	if (pos) {
		printf("%d\n", pos - text);
	} else
		puts("NOT FOUND!");

	pos = strstr(pos + strlen(key), key);
	if (pos) {
		printf("%d\n", pos - text);
	} else
		puts("NOT FOUND!");

	return 0;
}
